import Exif from "exif-js";

const checkCount = (file) => {
  this.isok = true;
  var self = this;
  Exif.getData(file, function () {
    self.Orientation = Exif.getTag(this, 'Orientation');
  });
  return true;
};

const addContent = (file) => {
  this.loading = true;
  this.num = 0;
  if (!this.isok) {
    return false;
  }
  let self = this;
  let result = file.content;
  let img = new Image();
  img.src = result;
  if (result.length <= (100 * 1024)) {
    self.uploadimg(file.content);
  } else {
    img.onload = function () {
      let data = self.compress(img, self.Orientation);
      self.uploadimg(data);
    }
  }
};

const uploadimg = (data) => {
  var config = {
    onUploadProgress: progressEvent => {
      var complete = progressEvent.loaded / progressEvent.total
      if (this.num == 1) {
        this.progress1 = complete
      } else if (this.num == 2) {
        this.progress2 = complete
      } else if (this.num == 0) {
        this.progress = complete
      }
    }
  }
  this.axios.post(CONSTANT.IMGUPLOAD_URL + "/file/", {
    path: '/jjrenter/',
    content: data
  }, config).then(res => {
    if (res.data.code == 0) {
      if (this.num == 1) {
        this.jjrInformation.idcardimg1 = res.data.data;
      } else if (this.num == 2) {
        this.jjrInformation.idcardimg2 = res.data.data;
      } else if (this.num == 0) {
        this.jjrInformation.businesslicence = res.data.data;
      }
    } else {
      this.$dialog.toast({
        mes: '文件上传失败',
        timeout: 1500,
        icon: 'error'
      });
    }
    if (this.num == 1) {
      this.loading1 = false;
    } else if (this.num == 2) {
      this.loading2 = false;
    } else if (this.num == 0) {
      this.loading = false;
    }
  })
};

const compress=(img, Orientation)=>{
  let canvas = document.createElement("canvas");
  let ctx = canvas.getContext('2d');
  //瓦片canvas
  let tCanvas = document.createElement("canvas");
  let tctx = tCanvas.getContext("2d");
  let initSize = img.src.length;
  let width = img.width;
  let height = img.height;
  //如果图片大于四百万像素，计算压缩比并将大小压至400万以下
  let ratio;
  if ((ratio = width * height / 4000000) > 1) {
    console.log("大于400万像素")
    ratio = Math.sqrt(ratio);
    width /= ratio;
    height /= ratio;
  } else {
    ratio = 1;
  }
  canvas.width = width;
  canvas.height = height;
  //        铺底色
  ctx.fillStyle = "#fff";
  ctx.fillRect(0, 0, canvas.width, canvas.height);
  //如果图片像素大于100万则使用瓦片绘制
  let count;
  if ((count = width * height / 1000000) > 1) {
    console.log("超过100W像素");
    count = ~~(Math.sqrt(count) + 1); //计算要分成多少块瓦片
    //            计算每块瓦片的宽和高
    let nw = ~~(width / count);
    let nh = ~~(height / count);
    tCanvas.width = nw;
    tCanvas.height = nh;
    for (let i = 0; i < count; i++) {
      for (let j = 0; j < count; j++) {
        tctx.drawImage(img, i * nw * ratio, j * nh * ratio, nw * ratio, nh * ratio, 0, 0, nw, nh);
        ctx.drawImage(tCanvas, i * nw, j * nh, nw, nh);
      }
    }
  } else {
    ctx.drawImage(img, 0, 0, width, height);
  }
  //修复ios上传图片的时候 被旋转的问题
  if (Orientation != "" && Orientation != 1) {

    switch (Orientation) {
      case 6: //需要顺时针（向左）90度旋转
        this.rotateImg(img, 'left', canvas);
        break;
      case 8: //需要逆时针（向右）90度旋转
        this.rotateImg(img, 'right', canvas);
        break;
      case 3: //需要180度旋转
        this.rotateImg(img, 'right', canvas); //转两次
        this.rotateImg(img, 'right', canvas);
        break;
    }
  }
  //进行最小压缩
  let ndata = canvas.toDataURL('image/jpeg', 0.1);
  tCanvas.width = tCanvas.height = canvas.width = canvas.height = 0;
  return ndata;
};

const rotateImg = (img, direction, canvas)=>{


  //最小与最大旋转方向，图片旋转4次后回到原方向
  const min_step = 0;
  const max_step = 3;
  if (img == null) return;
  //img的高度和宽度不能在img元素隐藏后获取，否则会出错
  let height = img.height;
  let width = img.width;
  let step = 2;
  if (step == null) {
    step = min_step;
  }
  if (direction == 'right') {
    step++;
    //旋转到原位置，即超过最大值
    step > max_step && (step = min_step);
  } else {
    step--;
    step < min_step && (step = max_step);
  }
  //旋转角度以弧度值为参数
  let degree = step * 90 * Math.PI / 180;
  let ctx = canvas.getContext('2d');
  switch (step) {
    case 0:
      canvas.width = width;
      canvas.height = height;
      ctx.drawImage(img, 0, 0);
      break;
    case 1:
      canvas.width = height;
      canvas.height = width;
      ctx.rotate(degree);
      ctx.drawImage(img, 0, -height);
      break;
    case 2:
      canvas.width = width;
      canvas.height = height;
      ctx.rotate(degree);
      ctx.drawImage(img, -width, -height);
      break;
    case 3:
      canvas.width = height;
      canvas.height = width;
      ctx.rotate(degree);
      ctx.drawImage(img, -width, 0);
      break;
  }
};

export default {
  buyToast,
}
